Oscillator
a technology of oscillator and oscillator, which is applied in the direction of oscillator stabilization, pulse automatic control, generator stabilization, etc., can solve the problems of difficult to expect an improvement of the frequency accuracy of ocxo, failure of temperature control, and unstable oscillation frequency, so as to reduce the fluctuation of oscillation frequency
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first embodiment
[0037]FIG. 1 is a block diagram illustrating an OCXO 1 according to an embodiment of the disclosure. The OCXO 1 includes a first crystal resonator 11, a second crystal resonator 12, and a first oscillator circuit 11A and a second oscillator circuit 12A that oscillate these crystal resonators. The first oscillator circuit 11A and 12A are constituted of, for example, a Colpitts oscillation circuit. In a latter part side of the first oscillator circuit 11A and the second oscillator circuit 12A, a frequency difference detector 13, a correction value operator 14, an addition unit 15, a PLL circuit unit 16, a low-pass filter (LPF) 17, and a crystal voltage control oscillator (VCXO) 18 are connected. Each of these circuits is disposed in a constant temperature oven.
[0038]The PLL circuit unit 16 treats an oscillation output from the first oscillator circuit 11A as a clock signal. The PLL circuit unit 16 converts a signal corresponding to a phase difference between a pulse signal that is gen...
second embodiment
[0057]An OCXO 5 according to a second embodiment will be described focusing on differences with the OCXO 1. As a difference in this OCXO 5 with respect to the OCXO 1, a heat control circuit 50 is included at a latter part of the PWM circuit 23 as illustrated in FIG. 3. The LPF 24 disposed at the latter part of the PWM circuit 23 in the first embodiment is included in the heat control circuit 50 as described later.
[0058]FIG. 4 is a block diagram of the heat control circuit 50. This heat control circuit 50 includes the heat control circuit 3 described in the first embodiment. Similar to the first embodiment, even in the heat control circuit 3 of this second embodiment, when a voltage applied to the input terminal on the +side of the differential amplifier 31 and a voltage applied to the input terminal on the −side both increase due to an increase of the supply voltage Vcc, resistance values of the respective resistors R are set such that an increase rate of the voltage applied to the ...
third embodiment
[0090]An OCXO 8 according to a third embodiment will be described with reference to FIG. 21 focusing on differences with the OCXO 5 of the second embodiment. This OCXO 8 includes a Digital Signal Processor (DSP) block 81 and a frequency divider 86. The DSP block 81 includes a PI operator 82 and a primary correction unit 83, as well as the frequency difference detector 13, the correction value operator 14, the addition unit 15, and the Pulse with Modulation (PWM) circuit 23, which are described above. The OCXO 8 denotes the memory 10 illustrated in FIG. 1 as a register 84 and the PLL circuit unit 16 and the VCXO 18, which are described above, as one PLL block 85. An output of the PLL block 85 is an output of the above-described VCXO 18. This output of the VCXO 18 is divided by the frequency divider 86 to become the output of this OCXO 8.
[0091]The DSP block 81, the first oscillator circuit 11A, the second oscillator circuit 12A, the PLL block 85, the register 84, and the frequency div...
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